Elapsed time
Elapsed time problems ask what time it will be, what time it was, or how long something took. Children count on or back in minutes and hours: 10:00 minus 15 minutes is 09:45.
How to solve this
- When calculating with time, work in minutes and hours separately — be careful at the 60-minute boundary.
- To find elapsed time, count on from the start time to the end time in steps of hours, then minutes.
- Check: start time + duration should equal the end time; count forward on a clock if unsure.
Examples
09:20 + 30 min
09:50
10:00 - 15 min
09:45
Practice problems with answers
Solve these problems on paper or out loud, then check the answer key. The online practice and the printable worksheet give a new set every time.
- 15:15 − 45 min = ___
- 13:30 − 30 min = ___
- 11:00 − 45 min = ___
- From 13:30 to 15:00 = ___ min
- 11:00 − 15 min = ___
- From 15:30 to 16:15 = ___ min
- 13:30 + 30 min = ___
- 13:15 − 15 min = ___
Show answers
- 14:30
- 13:00
- 10:15
- 90
- 10:45
- 45
- 14:00
- 13:00